On March 15, at least 49 people were killed and dozens more injured in Christchurch, New Zealand, when a gunman opened fire inside of two mosques. The shootings have been categorized as a terrorist attack.

The attacked involved multiple firearms and reported explosives.

As horrific as the crime already is, the gunman livestreamed a video of the shooting on social media, documenting his venture from his car into the mosque. Officials are working to remove the graphic imagery from online.

The suspected shooter, Australian 28-year-old Brenton Harrison Tarrant, who wrote a manifesto referencing “white genocide” driven by “mass immigration,” has been charged with the murder.

In the manifesto, the gunman rhetorically asked himself why he chose to use firearms to carry out the attack. He answered that “I chose firearms for the affect it would have on social discourse…with enough pressure the left wing within the United States will seek to abolish the second amendment, and the right wing within the U.S. will see this as an attack on their very freedom and liberty.”

“In terms of tactics, the neo-fascist groups, the white supremacists, are borrowing from the ISIS playbook,” said New York Police Deputy Commissioner for Intelligence and Counterterrorism John Miller.

According to Miller, authorities will “increase police presence around mosques, around houses of worship.”